anemet added a comment.
In http://reviews.llvm.org/D21773#469596, @lihuang wrote:
> IV is promoted to 64-bit but the trunc/zext cannot be eliminated (at least
> cannot be eliminated with the -O1 pass pipeline). Then optimzation remark
> becomes:
>
> optimization-remark-options.c:17:3: remark: loop not vectorized: cannot
> identify array bounds
> [-Rpass-analysis=loop-vectorize]
> for (int i = 0; i < N; i++) {
That sounds like an optimization regression. It seems to me that you could
create a testcase with fewer arrays than in the above test such that you don't
exceed the max number of memchecks. This new testcase would be vectorized
before http://reviews.llvm.org/D18777 but not after.
Adam
http://reviews.llvm.org/D21773
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